John s



(No Model.)

J. S. EBERT.

PRESSURE SCREW FOR SGREW PRESSES. No. 302,327.

Patented July 22, 1884.

.NITED STATES PATENT Fl lC PRESSURE-SCREW FOR SCREW-PRESSES.

SPECIPICATIQNforming part of Letters Patent No. 302,327, dated July 22, 1884.

Application filed December 26, 1853.

.To all whom it may concern Be it known that I, JOHN S. EBERT, a citizen of the United States, residing in the city of Brooklyn, in the county of Kings and State of New York, have invented a certain new and useful Device for Operating the Pressure- Screws f Screw-Presses and Similar Devices,

.of which the following is a specification.

I am aware that heretofore the pressure' screws in lifting-jacks and other similar devices have been operated by worm-gears interposed between and engaging with the actuating-nut and crank or other source of power.

The object of my invention is to attain the advantages attending the use of a drivingworm working at right angles to the actuatingnut, and at the same time forward the pressurescrew without revolving it upon its longitudinal axis, and obviate the necessity for slotting it longitudinally or otherwise weakening its thread.

The invention consists in the combination and arrangement, with a pressure-screw held by suitable means against revolution upon its longitudinal axis, but capable of longitudinal motion in either direction, of an actuatingnut supported between stationary shoulders, and provided with an interior female thread for engaging the thread of the pressurescrew, and with exterior teeth for engagement with a driving-worm, which is in turn operated by'a crank or other means of imparting motion.

A secondary feature of my invention con sists in the peculiar construction and arrangement of the stationary bearing-box for the reception of the actuating-nut and driving worm,,as hereinafter set forth.

In the accompanying drawings, which show only a portion of a pressure-screw, together with the actuating-nut and driving-worm, Figure 1 is an elevation of the stationary nutbox and bearing; Fig. 2, a sectional View of one side of the screw-actuating nut and of the worm-wheel, one side of the stationary bearing-box being removed. Fig. 3 is an elevation of the parts, taken at right angles to Figs. 1 and 2. Fig. 4 is atransverse section on plane of line 50 :12, Fig. 2, showing the driving-worm in elevation. Fig. 5 is an end view of the pressure-screw, showing the square head or (No model.)

shoulder-piece,which, by engaging with guideways in the frame, prevents the revolution of the said pressurescrew upon its longitudinal axis.

The bearing-box B is attached to andineon porated with the frame or other stationary portion of the press or other device to which my improvements are applied. It is preferably cast in two parts, B D which are duplicates of each other, except that they are respectively rights and lefts,which, when bolted together, afford suitable bearings, b I), for the axle d of the driving-worm D, as well as affording supporting-shoulders Z) Z), between which the actnatingnut N is confined by the pressure-screw S, which passes through annular openings 2) b formed between the said shoulders b b. The pressure-screw is prevented from revolving upon its longitudinal axis in any of the ordinary devices resorted to in this class of apparatus, that shown in the drawings, which consists of a square shoulder-piece,

"Sflpassing over or between suitable guideways, S As shown in the drawings,thisstationary bearing-box B consists of two plates, 13 B from the opposed sides of which coinoiding yokes or flanges B 13 project a sufficient distance to leave interior spaces large enough to accommodate the actuating-nut and driving-worm when the plates B B are fastened together by bolts 0 c, the yokes orflanges B B at the same time inclosing and protecting the parts and centralizing them accurately with relation to each other. I am enabled thus to yoke the parts together by what practically constitutes, when bolted, a single rigid bearing piece or casing, thus avoiding the looseuess, undue wear, and inaccuracy of adbearings are provided, and rendering the action of the parts smooth and easy.

The combined bearingbox is simple and cheap of construction, and the facility with which the parts may be put together is to be observed. the actuating-nut N and of the driving-worm D are at right angles to each other, and that the said parts bear such relation to each other that the endless screws or worms (1 upon the driving-wheel mesh into the inclined gear- It is to be noticed that the axes of 9 5 W held.

.revolving it upon its axis within a stationary teeth formed upon the periphery of the nut N. XVhile the revolution of the worm-threads upon the driving-Wheel D will thus impart to the nut an impetus at right angles to its axis that will cause it to revolve thereon, it will be seen that-the reverse action cannot take placez'. 6., the nut cannot cause the worm-wheel to revolve, no matter how great the pressure, simply for the reason that the teeth upon the periphery of the nut can only impart a strain upon the driving-worm in a line parallel to its axis, and the greater this back strain may be the more securely will the worm-wheel D be It is to be observed that by this construction the nut acts directly upon the press ure-screw to forward it, and not as a means of nut, and that the threads on the pressurescrew are unimpaired and continuous. The construction of the press is thus rendered much more simple and inexpensive, and by moving the pressure-screw without revolving it upon its longitudinal axis the necessity for using a swiveled head or follower is obviated, and the device adapted for use in a variety of j circumstances where a swiveled bearing or foll lower would be objectionable-as, for instance, 1

a driving-worm, substantially in the manner and for the purpose described.

2. In combination with the pressure-screw and its actuating-nut and the driving wormwheel, arranged substantially as described, the bearing box or yoke formed in two parts, with suitable bearings and supporting-shoul ders formed upon and between coinciding flanges, which inclose and protect the parts.

JOHN S. EBERT.

\Vitnesses:

Gno. WV. MIATT, 7M, G-ARDl ER. 

